51005533 has 2 divisors, whose sum is σ = 51005534. Its totient is φ = 51005532.

The previous prime is 51005503. The next prime is 51005551. The reversal of 51005533 is 33550015.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31663129 + 19342404 = 5627^2 + 4398^2 .

It is a cyclic number.

It is not a de Polignac number, because 51005533 - 2⁹ = 51005021 is a prime.

It is a super-2 number, since 2×51005533² = 5203128793228178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51005503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25502766 + 25502767.

It is an arithmetic number, because the mean of its divisors is an integer number (25502767).

Almost surely, 2^51005533 is an apocalyptic number.

It is an amenable number.

51005533 is a deficient number, since it is larger than the sum of its proper divisors (1).

51005533 is an equidigital number, since it uses as much as digits as its factorization.

51005533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1125, while the sum is 22.

The square root of 51005533 is about 7141.8158055217. The cubic root of 51005533 is about 370.8563873841.

Adding to 51005533 its reverse (33550015), we get a palindrome (84555548).

The spelling of 51005533 in words is "fifty-one million, five thousand, five hundred thirty-three".